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Re: [PATCH] migration: Truncate state file in xen-save-devices-state
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [PATCH] migration: Truncate state file in xen-save-devices-state |
Date: |
Mon, 21 Sep 2020 12:17:23 +0100 |
User-agent: |
Mutt/1.14.6 (2020-07-11) |
* Dov Murik (dovmurik@linux.vnet.ibm.com) wrote:
> When running the xen-save-devices-state QMP command, if the filename
> already exists it will be truncated before dumping the devices' state
> into it.
>
> Signed-off-by: Dov Murik <dovmurik@linux.vnet.ibm.com>
> ---
OK, that looks fine to me, so:
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
>
> Note that I found the above issue while trying to debug
> xen-load-devices-state which simply fails (prints "Configuration section
> missing" to stderr) directly after xen-save-devices-state (in the same
> VM). I wonder if I should file a bug report as-is or investigate some
> more. Advice welcome.
I don't try the xen-* commands normally; I've cc'ing in Stefano and
Anthony.
Dave
>
> -Dov
>
> ---
> migration/savevm.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/migration/savevm.c b/migration/savevm.c
> index 304d98ff78..e1b26672cc 100644
> --- a/migration/savevm.c
> +++ b/migration/savevm.c
> @@ -2803,7 +2803,8 @@ void qmp_xen_save_devices_state(const char *filename,
> bool has_live, bool live,
> vm_stop(RUN_STATE_SAVE_VM);
> global_state_store_running();
>
> - ioc = qio_channel_file_new_path(filename, O_WRONLY | O_CREAT, 0660,
> errp);
> + ioc = qio_channel_file_new_path(filename, O_WRONLY | O_CREAT | O_TRUNC,
> + 0660, errp);
> if (!ioc) {
> goto the_end;
> }
> --
> 2.20.1
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK